Pencil-sharpener.



PATENTED MAY 26, 1908.

R. V. COLLINS. PENCIL SHARPENER. urmonzon FILED JAN. 17, 1907.

-SHEET1.

Z BHEETS Inventor:

No. 889,179. I PATENTED MAY-26,1908.

R. v. COLLINS.

PENCIL SHARPENER.

APPLIO4TION FILED JAN. 17, 1907.

2 SHEETS-SHEET 2.

. Ihventor: fl K by x I ROY v. COLLINS, or NEW Yomi, N. Y.

PENCIL-SHARPENER.

Specification of Letters Patent.

;Patented May 26, 1908.

Application filed January 17, 1907. Serial No. 352,686.

To all whom it may concern:

Be it known that I, ROY V. COLLINS, a citizen of the United States, and a resident of the borough of Manhattan, of the city of New York, in the county and State of New York, have invented certain new and useful Improvements in Pencil-Sharpeners of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

The general object of the present invention is to provide a pencil sharpener which shall be operated from a suitable source of power, such as that supplied by a spring or an electric motor, and which shall operate t0v sharpen a pencil without breaking the point. Heretofore, in pencil Sharpeners of this sort, the point of the pencil was frequently broken durlng the sharpening, and, where knives were employed to efiect the sharpening, they repeatedly became dulled by the action of the graphite upon them and had to be resharpened or replaced. In the present case, to overcome these objections, the sharpening is done by an emery or carborundum wheel, or by a wheel of a similar nature, such wheel being provided with a relatively broad periphery against which the end of the pencil is made to bear during the sharpening operation. By providing such a wheel and by grinding the pencil upon the periphery of this wheel, uniformly satisfactory results are produced.

Another object of the invention is the provision of means whereby the power is applied automatically when a pencil is inserted into position for shar ening.

Still another 0 ect of the invention is to provide a simple attachment for an electric motor whereby all of the improvements may be conveniently embodied in a simple structure.

The invention will be more fully described hereinafter with reference to the accompanying drawings in which,

Figure 1 is a view in elevation of an electric motor, looking toward the motor in the direction of its armature shaft; the motor being provided with the attachment just referred to. Fig. 2 is a similar view on a smaller scale, at right angles however to the elevation of Fig. 1. Fig. 3 is a detail view mostly in section, showing the interior of the attachment and the grinding wheel upon the motor shaft in operative engagement with a pencil which is being sharpened. Fig. 4 is a detail sectional view upon a plane indicated by the line 4-4 of Fig. 3, and, Fig. 5 is a plan view of the dust box as seen from above the plane indicated by the line 55 of Fig. 1.

As will be obvious, the power in the present case is supplied by an electric motor a. which may be of any suitable construction, preferably one which is small and compact. Upon the shaft of the motor is secured the grinding wheel I) which is preferably of carborundum or emery. Over this Wheel there is fitted an attachment which includes a casing 0 for the grinding wheel and a pencil holder through which the pencil is inserted in order to bring its endin proper relation with the grinding wheel for the shar ening. Such pencil holder may consist of a s eeve d rotatable in a hollow bracket e which is firmly secured to the casing c, the sleeve and bracket being arranged at an angle to the periphery and axis of the wheel, -as will be understood. Within the rotatable sleeve are provided leaf springs f whereby pencils of different sizes may be properly held as the sharpening proceeds.

The means which are employed for automatically setting the device in operation as the pencil is inserted may comprise a ring g, constituting one terminal of an electric switch, suitably secured around the bracket e, and a s ring finger h secured to the sleeve d within t e ring g, which finger constitutes the other terminal of said switch. Said automatic means further includes a projection i (Fig. 4) upon one of the springs f which projection extends through the sleeve (1 and bears against the spring finger h, whereby as the pencil is inserted, the projection upon the spring f presses the spring linger in contact with the ring 5/, thus bringing the two terminals of the circuit in contact. The ring g is insulated from the rest of the attachment which is preferably of metal by means of suitable insulation 7c (Fig. 3), and the terminals of the circuit may be connected respectively to the ring 9 and to any convenient point upon the attachment, as illustrated in Fig. 2.

The attachment is secured to the motor above and below by means of two thumb screws Z and, as shown in Fig. 2, one of the terminals of the electric circuit is brought underneath the upper thumb screw Z which thus also serves as a Sort of binding post. Attached to the casing 0, preferably so as to be conveniently removable, is a dust box, or

collector m into which the particles 0f ground material are discharged from the casing c.

The operation of the device will be understood from the foregoing description and need not be repeated at length at this point.

Various departures from the construction shown and described herein may obviously be made without departing from the invention.

I claim as my invention:

1. The combination with an electric motor having a casing and a support, of a grinding wheel secured to the shaft of the motor upon the exterior of the casing, a removable casing for the grinding wheel having a pencil holder, and two thumb screws for securing N the casing of the grinding wheel to the casing of the motor above and below the grinding wheel respectively.

2. The combination of an electric motor, a grinding wheel driven thereby, a sleeve arranged at an angle to the axis of said wheel to hold a pencil, and a switch controlling the motor one terminal of which switch consists of a ring around the sleeve and the other terminal of a finger between the ring and sleeve, said finger being adapted to be pressed against the ring when the pencil is inserted in the sleeve.

- 3. The combination with a motor, of a grinding wheel on the shaft of the motor, a casing for the wheel, thumb screws to secure the casing to the motor, a pencil holder car ried by the casing, and a dust collector also carried by the casing and removable therefrom.

This specification signed and witnessed this fourteenth day of January, 1907.

ROY V. COLLINS. Signed in the presence ol LUoIUs E. VARNEY, AMBROSE L. OSHEA. 

